Conflict of Interest
All authors declare that they have no conflicts of interest.
Acknowledgments
We are grateful to MSc. Carlos Alberto da Silva Ribeiro, MSc. Filipe Ferreira Galvão, MSc. Flávia Bonamin, Dr. Leonardo Noboru Seito, and Daniele Oliveira Köhn for technical assistance. This work was part of the PhD dissertation of Celso A.R.A. Costa and was sup- ported by grants from FAPESP – Fundação de Amparo à Pesquisa do Estado de São Paulo (Celso A.R.A. Costa – Proc. n . 2006/07195-8 and Lucas T. Bidinotto – Proc. n . 2006/58174-0).